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"Vol. I [Texte] contains 5 plates from photographs by Drivet's two heliogravure processes, on in lined half-tone and the other in random dot process. Vol. II [Planches de paléontologie] contains 79 (i.e. 87) plates, 4 of them by Drivet in lined half-tone and the rest in photolithography by A. Bilordeau in association with E. Lacan."--Hanson Collection catalog, supplement [8]